Chaeles a



(No Model.)

G. A. LU'DLOW.

TUMBLERFORLOOKS.

No. 295,260, Patented Mar. 18,1884.

' N. ".1585. Pmioihhngnphun Wash'mglo v. D. c

UNITED STATES PATENT Fries.

HALF TO IVALTER LIFE, OF NEW YORK, N. Y. I

TUMBLER FOR LOCKS.

SPECIFICATION forming part of Letters Patent No. 295,260, dated March 18, 1884.

Application filed January 18, 1884. (No model.)

To all whom it may concern..-

Be it known that I, CHAnLns A. LUDLow, of Bridgeport, in the county of Fairfield and State of Connecticut, have invented a new and useful Improvement in Tumblers for Locks, of which the following is a specification.

My invention relates to those locks inwhich the bolt is operated by means of a tumbler consisting of a crank or cranked shaft, the wrist of which engages with a slot or notch in the bolt, and the journals of which are supported in hearings in the side plates of the lock-case.

The invention is more particularly applicable to the manufacture of tumblersof the kind above described for locks which are to be sold at a verylow price, and which are used for sewing-machine drawers and other purposes where only a very simple lock is re quired. It is, however, of importance that the journals of the cranked sh aft or tumbler should be of such size that they may be properly supported. by the bearings in the side plates of the lock-ease, and in order that one of said journals may have formed in it the socket, of square or other shape, with which the key is engaged to turn the tumbler.

The object of my invention is to provide for making tumblers of the kind above described from sheet metal, and by the simple processes which are common in working sheet metal.

The invention consists in a tumbler composed of two hollow journals, one of which is closed at the outer end, and the other of which is open at the outer end to receive a key, and a connecting wrist or portion extending between the hollow journals at their circumference, all formed integral with each other from sheet or plate metal, as hereinafter described.

The invention also consists in a novel method of making a tumbler, of the kind above mentioned, of sheet metal, as hereinafter fully described.

In the accompanying drawings, Figure 1 represents a blank or piece of sheet metal from which a tumbler may be formed. Fig. 5 represents the finished tumbler. Figs. 2, 3,

and 4 illustrate the several steps in the method of making the tumbler, and Figs. 6 and 7 represent vertical sections in planes at right angles to each other of a lock in which my improved tumbler is used. Y

Similar letters of reference designate corresponding parts in all the figures.

For making tumblers according to my invention, I employ a metal which is suificiently ductile to enable it to be cupped or drawn by means of dies-such, for example, as soft brass or comp ositionand of a thickness which will give the tumbler the necessary strength. Itake a piece of sheet metalsuch as is shown in Fig. 1and, by means of suitable dies, I cup or draw it at thepoints a. a, shown in Fig. 2,) it being cupped or drawn to a depth corresponding to the length which is desired for the journals of the finished tumbler. I then cut the piece on the dotted line b, Fig. 2, and I thus produce a blank of the form shown in Fig. 3, which consists of two little cups or concave portions, a a, connected byaneck, a I then punch in the cup or portion a a hole, 0, of square or other form, and of a size which adapts it to receive the key to be used with the tumbler. The hole or socket c is shown in Fig. 4:. I then bend the neck a at its juncttions to a into positions at right angles to the neck c and in-line with each other, as shown in Fig. 5. The two portions a a, being in line, are now capable of serving as journals for the tumbler, and the connecting portion a constitutes the .wrist of the tumbler.

By the method above described I produce a tumbler composed of two hollow journals, one of which, a, is closed at the outer end, and the other of which, a, is open at the outer end, a, to receive a key, the said journals being connected by the integral wrist or portion c Each portion a a may have a socket, c, if desired.

Referring now to Figs. 6 and 7, Adesignates the lock-bolt, which is provided with a transverse slot or notch, d, and B B designate the side plates or portions of a skeleton lock-case. B B designate the two ends of the case,which are slotted to receive the bolt Athrough them. As here represented, the side portions, B B,

, to the end plate 13 at e.

and the end portion 13 consist of a single piece of metal bent to the proper form, and having its ends inserted through and riveted In the side plates or portions, B B, are bearings e for the journals a a, and the Wrist or connecting portion a engages with the notch or slot (1 in the bolt A. A spring, f, serves to impel the bolt A forward when the tumbler is turned by a key inserted in its hole or socket 0.

My improved tumbler is particularly intended for looks having a skeleton case, and which are of cylindric form, so that they may be inserted into holes formed with an ordinary boring-bit; but the invention is applicable to looks having cases of other form.

What I claim as my invention and desire to secure by Letters Patent, is-

1. The lock-tumbler herein described, consisting of the hollow journals a a, the journal at being closed at its outer end, and the journal a having in it the key-socket c, and the wrist or connecting portion a all formed integral with each other from sheet or plate metal, substantially as herein specified.

2. The method of producing alock-tumbler from sheet or plate metal, consisting in first producing a blank having the cupped or drawn portions a a and the connecting neck or portion a", in forming a key-socket, c, in one or both of said cupped or drawn portions, and in bending the said blank to bring the said portions a a into line with each other and at right angles to the portion a all substantially as herein described.

CHARLES A. LUDLOW.

Vitnesses:

FREDK. HAYNES, JOHN BECKER. 

